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你知道煤的年龄吗?乍一听这个问题,你会觉得奇怪,煤,有年龄吗?回答是肯定的,但煤的年龄可不是用年来计算的,而是以万年为最小单位。
Do you know the age of coal? At first glance, would you find it strange that coal has age? The answer is yes, but the age of coal is not measured in years, but in years as a minimum unit.